Most disinfection devices on systems manufactured in Texas use tablet chlorination. The photo below shows the typical tablet chlorinator setup. In the last tank, there will be a white, 4” PVC pipe with a translucent blue tube. This is the chlorinator. Pull it out and add 3-4 chlorine tablets and check it monthly.
Chlorine usage depends directly on water usage. If you use more water, then you will use more chlorine. If you check at a month and the chlorine has been totally used up, add some more and check it at 2 weeks. Over time you will learn your individual schedule based on your usage.
Norweco Style Chlorinator
Pro Chlor Tablets
Commonly available at Home Depot locations
Norweco Tablets
Commonly available at Lowes locations
Septic Fit Tablets
Commonly available at smaller retailers such as ACE Hardware